package com.ly218wc.springcloud.lb;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

@Component
public class MyLB implements LoadBalanced {

    private AtomicInteger atomicInteger =new AtomicInteger(0);
    public final int getAndIncrement(){
        int current;
        int next;
        do {
            current= this.atomicInteger.get();
            next=current>=Integer.MAX_VALUE?0:current+1;
        }while (!this.atomicInteger.compareAndSet(current,next));
        System.out.println("第几次访问"+next);
        return next;
    }
    @Override
    public ServiceInstance instances(List<ServiceInstance> serviceInstances) {
        int index = getAndIncrement() % serviceInstances.size();
        ServiceInstance serviceInstance = serviceInstances.get(index);
//        System.out.println("选择了"+serviceInstance.toString());
        return serviceInstance;
    }
}
